Starting induction-motors



J. BRUNCKEN. STARTING INDUCTION MOTORS. APPLICATION FILED DEC- 2. 1920.

1,392,555, Patented Oct. 4, 1921.

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' UNITED STATES PATENT "OFFICE. I

' 'J'OHANNES BRUNCKEN, F COLOGNE-BIGKENDORF, GERMANY.

STARTING INDUCTION-MOTORS.

Specification of Letters Patent.

Patented Oct. 4, 1921.

Original application filed January 13, 1920, Serial No. 351,240. Divided and this application filed Decemher 2, 1920. Serial No. 427,835.

To all whom it may concern:

Be it known that I,,JoHANNns BRUNOKEN, citizen of Germany, residing at Cologne: Bickendorf, have invented certain new and useful Improvements in Starting Induction- Motors, (for which I have filed an application in Germany, July 17, 1919,) of which the following is a specification, reference beingr.

his lnvention relates to lmprovements 1n the method of starting induction motors described and claimed in my application Serial No. 351,240, filed January 13, 1920, and the present applicationis a division thereof.

The invention is clearly illustrated in theview if machines can be designed for either of two voltages.

Now a double induction motor constructed for starting in the manner described may, according to this invention, be utilized for either of two voltages, which, as a rule, are in the ratio of /3 to 1. For instance, if such a double motor is designed for 380 volts and to be started in the manner 'described, the same motor may also be eming had therein to the accompanying draw-.

ploye d upon a supply of 220 volts and be started in the manner described hereinafter.

The various stages in starting the motor are illustrated in the accompanying drawmg in the same manner as in our original patent application, 1, 2 and 3 indicating the .three phases, and a and b the two stator windings.

In the 1st stage the two stator windings are connected in series in mesh; in the 2nd they are connected in parallel in star; in the 3rd they are connected in parallel, one in star and one in mesh; in the 4th they are connected in parallel both in mesh; in the 5th they are agam connected in parallel in mesh but the one field is shifted through 180 relatively to the other.

Having now particularly described and ascertained the nature of my said invention and in what manner the'same is 'to be performed, I declare that what I claim is:

.The method of starting an induction motor having two separate sets of primary wmdmgs, which consists in successively connecting said windings in series in mesh, in parallel in star, in parallel one in star and one 1n mesh, in parallel in mesh, and finally shifting the field produced by one winding relatively to the field produced by the other through 180.

In testimony whereof I aflix my signature in the presence of two witnesses.

' J OHANNES BRUNCKEN.

Witnesses:

AUG. BAUER,

JEN BLUMEME. 

